CN110983853A - Method for producing T paper by long-wire paper machine - Google Patents

Method for producing T paper by long-wire paper machine Download PDF

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Publication number
CN110983853A
CN110983853A CN201911152080.1A CN201911152080A CN110983853A CN 110983853 A CN110983853 A CN 110983853A CN 201911152080 A CN201911152080 A CN 201911152080A CN 110983853 A CN110983853 A CN 110983853A
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China
Prior art keywords
paper
pulp
concentration
papermaking
dye
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CN201911152080.1A
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Inventor
贾少军
颜建秋
王勇
杨鸿平
王传颂
刘德安
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Shanying South China Paper Co Ltd
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Shanying South China Paper Co Ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents

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Abstract

The invention belongs to the technical field of pulping and papermaking, and particularly relates to a method for producing T paper by using a fourdrinier machine. The production process for producing the T paper by using the fourdrinier paper machine is provided by taking national waste A/B and European waste containing much white cardas raw materials, can flexibly configure the production of the fourdrinier paper machine according to the requirement of the market on the staged quantity of corrugated paper and T paper products, and greatly improves the diversity of products which can be supplied by the fourdrinier paper machine. The operation cost of paper making enterprises is reduced, and the profit margin of each ton of paper is improved.

Description

Method for producing T paper by long-wire paper machine
Technical Field
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a method for producing T paper by using a fourdrinier machine.
Background
The weight of the T paper is also called C paper, linerboard (linerboard) and liner paper, and the basis weight is 125-2One side of the T paper is better, and the other side is poorer. T paper is recycled paper, and is composed of OCC in its entirety, but is different from corrugated paper. The surface of the AOCC fine dried noodles is more than 11# and is dyed. The market is generally referred to as class C linerboard and in part as T-sheet.
Fourdrinier machines, because they have only one layer of sizing system, are generally used only for the production of corrugated board, and are more costly to produce in high grammage. The production of the cardboard paper generally needs at least two nets, the bottom layer is equivalent to the middle pulp and the corrugated paper process, the surface pulp needs to be relatively clean pulp because the waste paper raw materials contain impurity points, black points, white points and the like, but if the pure clean pulp is used, the bottom layer and the middle layer can cause waste. Therefore, the corrugated paper products produced by the fourdrinier paper machine are lack of diversity, and the operating cost and the operating benefit of the fourdrinier paper machine are lower. Especially when the demand of the corrugated paper market is very small, the long mesh paper machine is not driven for a long time, and the corrugated paper generates negative gross profit per ton of paper. In general, paper-making enterprises cannot produce T paper by using the fourdrinier paper machine based on the structure and the production process characteristics of the fourdrinier paper machine.
Disclosure of Invention
In view of the above technical problems in the background art, it is desirable to provide a production process for producing T-paper by using a fourdrinier machine, so as to improve the diversity of products that can be supplied by the fourdrinier machine, meet the requirement of the market for the staged quantity of corrugated paper and T-paper products, flexibly adjust the production of the fourdrinier machine, further reduce the operation cost, and improve the profit per ton of paper.
In order to achieve the aim, the inventor provides a production process for producing T paper by using a fourdrinier machine, which comprises the following steps:
preparing materials: taking national waste A/B and European waste containing leucocarpin as raw materials;
pulping: mixing the raw materials with water by mass percent to obtain 3.0-4.5% of the mixture, and crushing the mixture to obtain crushed pulp;
purifying, screening and deslagging: purifying, screening and deslagging the crushed pulp;
concentrating, pulping and preparing pulp: concentrating in multiple discs until the mass concentration is 4-5%, pulping until the beating degree of the pulp is 38-42 DEG SR, preparing the pulp, and sending the pulp into a pre-pulping tank;
the method comprises the following steps of pulp enhancement of a fore-stock, papermaking by a fourdrinier machine, dehydration, surface sizing, calendaring and slitting, wherein when the fourdrinier machine is used for papermaking, the vacuum degree of a wire part is as follows: 6 to 8kPa of low vacuum fan at the net part, 9 to 11kPa of high vacuum fan at the net part, 32 to 37kPa of transfer vacuum at the bottom net, 2.5 to 3.5kPa of vacuum at the top net, 37 to 41kPa of low vacuum at the bottom net I, 38 to 42kPa of high vacuum at the bottom net II, 52 to 55kPa of low vacuum at the V-shaped rod, and 54 to 58kPa of high vacuum at the V-shaped rod.
Different from the prior art, the technical scheme at least has the following beneficial effects:
the production process for producing the T paper by the fourdrinier machine can flexibly configure the production of the fourdrinier machine according to the requirement of the market on the staged quantity of corrugated paper and T paper products, and greatly improves the diversity of products which can be supplied by the fourdrinier machine. The operation cost of paper making enterprises is reduced, and the profit margin of each ton of paper is improved.
Detailed Description
The process of the present invention for producing T-paper using a fourdrinier machine is described in detail below.
A method of making T-paper with a fourdrinier machine comprising the steps of:
preparing materials: taking national waste A/B and European waste containing leucocarpin as raw materials;
pulping: mixing the raw materials with water by mass percent to obtain 3.0-4.5% of the mixture, and crushing the mixture to obtain crushed pulp;
purifying, screening and deslagging: purifying, screening and deslagging the crushed pulp;
concentrating, pulping and preparing pulp: concentrating in multiple discs until the mass concentration is 4-5%, pulping until the beating degree of the pulp is 38-42 DEG SR, preparing the pulp, and sending the pulp into a pre-pulping tank;
the method comprises the following steps of pulp enhancement of a fore-stock, papermaking by a fourdrinier machine, dehydration, surface sizing, calendaring and slitting, wherein when the fourdrinier machine is used for papermaking, the vacuum degree of a wire part is as follows: 6 to 8kPa of low vacuum fan at the net part, 9 to 11kPa of high vacuum fan at the net part, 32 to 37kPa of transfer vacuum at the bottom net, 2.5 to 3.5kPa of vacuum at the top net, 37 to 41kPa of low vacuum at the bottom net I, 38 to 42kPa of high vacuum at the bottom net II, 52 to 55kPa of low vacuum at the V-shaped rod, and 54 to 58kPa of high vacuum at the V-shaped rod.
As a preferable scheme of the invention, the pulp concentration of the pre-papermaking pond bottom pulp obtained by the pre-papermaking pond pulp strengthening step is 3.6-3.8%, the beating degree is 38-42 DEG SR, and the wet weight is 6-9 g.
In the preferable scheme of the invention, in the paper making step of the fourdrinier machine, the approach consistency of the bottom pulp of the fore-machine pool is 1.2-1.5%, the retention rate is not less than 65%, and the pulp wire speed ratio is not less than 0.99.
In a preferred embodiment of the present invention, the lip opening of the headbox of the fourdrinier machine is 10.6-11.5.
In a preferred embodiment of the present invention, the domestic waste a/B and the european waste containing leucocado are mixed in a mass ratio of 1:1 to obtain the raw materials.
As a preferable scheme of the invention, the purification screening and deslagging comprises the following steps:
the high-concentration slag separator is used for controlling the concentration of crushed pulp to be 3.0-4.5%, the concentration of the coarse sieve is controlled to be 2.0-3.5%, the concentration of the heavy slag separator is less than or equal to 1.0%, and the concentration of the first-stage fine sieve is 1.0-1.5%.
As the preferable scheme of the invention, in the slurry preparation step, the flow rate is more than or equal to 200m3The mass concentration of the slurry supply is 4.0-4.5 percent.
As a preferable scheme of the invention, in the pulp preparation step, a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.2-0.25kg/t of paper, the dosage of the filter aid is 0.15-0.20kg/t of paper, and the dosage of the dye comprises 3.5-4.5kg/t of paper of yellow dye, 0.5-0.9kg/t of paper of red dye and 0-0.5kg/t of paper of black dye.
In a preferred embodiment of the present invention, the pre-papermaking pond slurry has a color of L: 64-65.5, a: 3.9-4.5, b: 14.0-14.4. Where L (brightness index L) is a lightness index of paper, and in a three-dimensional color space that is visually nearly uniform, it indicates a coordinate of a color lightness value of an object, and when L is 0, it indicates a black body that absorbs light totally, and when L is 100, it indicates a pure white object that reflects light totally. ab (chromaticity index) is a chromaticity index indicating chromaticity coordinates of chromaticity in a three-dimensional color space which is visually nearly uniform, a being a positive value indicating a reddish degree, a being a negative value indicating a greenish degree, b being a positive value indicating a yellowish degree, and b being a negative value indicating a bluish degree.
As a preferable scheme of the invention, in the concentration step, the water quantity of a plurality of discs is controlled to be 550-650m3/h。
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
Examples 1-9 all produced T paper using the following manufacturing process.
A method of making T-paper with a fourdrinier machine comprising the steps of:
preparing materials: mixing the national waste A/B and the European waste containing the leucocarpin according to the mass ratio of 1:1 as raw materials;
pulping: mixing the raw materials with water by mass percent to obtain 3.0-4.5% of the mixture, and crushing the mixture to obtain crushed pulp;
purifying, screening and deslagging: purifying, screening and deslagging the crushed pulp;
concentrating, pulping and preparing pulp: performing multi-disc concentration, controlling the water amount of the multi-disc at 550-3Concentrating to the mass concentration of 4-5%, pulping until the beating degree of the pulp is 38-420SR, preparing the pulp, and sending the pulp into a pre-papermaking pool;
enhancing the pulp of the pre-papermaking pond, papermaking by a fourdrinier machine, dewatering, surface sizing, calendering and slitting, wherein the color of the pulp of the pre-papermaking pond is L: 64-65.5, a: 3.9-4.5, b: 14.0-14.4. When the fourdrinier machine is used for papermaking, the vacuum degree of the wire part is as follows: 6-8 kPa of a low-vacuum fan at the wire part, 9-11 kPa of a high-vacuum fan at the wire part, 32-37 kPa of transfer vacuum at a bottom wire, 2.5-3.5 kPa of top wire, 37-41 kPa of low vacuum at a bottom wire I, 38-42 kPa of high vacuum at a bottom wire II, 52-55 kPa of low vacuum at a V-rod and 54-58 kPa of high vacuum at a V-rod, wherein in the papermaking step of the fourdrinier, the retention rate in a head box of the fourdrinier is more than or equal to 65%, and the pulp wire speed ratio is more than or equal to 0.99.
In the process of obtaining the invention, in order to meet the appearance characteristics of the T paper with required indexes, through repeated trial production and demonstration, the inventor finds that the paper made by the American waste and the European waste has better physical properties because the recycle frequency of the American waste in the waste paper raw material is less than that of the European waste and the fiber is longer; the Europe waste containing much white cardo has less recycling times than the national waste and longer fiber, so the paper made by the Europe waste and the national waste has better physical performance. If the all-Europe waste paper is used, the index of the T paper is higher, but the index of the T paper is not required to be higher, so that the waste of resources and cost is caused; if national wastes are used, the index requirements of T paper cannot be met, and the national wastes are unstable in quality, for example, the content of coated paper is high sometimes, so that white spots on paper surfaces are more likely to influence the appearance quality. Therefore, the domestic waste and the European waste are optimized and adjusted in proportion, and the European waste are mixed in a ratio of 1:1 as raw materials by combining various cost, physical indexes and appearance indexes.
The T paper quantitative determination provided by the invention is determined by a method specified in GB/T451.2-2005 quantitative determination of paper and paperboard; the T paper moisture is measured according to the method specified in GB/T462-2008 'determination of moisture of paper, paperboard and pulp analysis samples'; the water absorption performance of the T paper is determined according to the method specified in GB/T1540 and 2002 Korea method for determining the water absorption of paper and paperboard; the color indexes L, a and b of the T paper are measured by referring to the method specified in GB/T7975-; the bursting property of the T paper is determined by the method specified in GB/T1539-2007 determination of the bursting strength of the paper board; the folding resistance of the T paper is measured by the method specified in GB/T457-2008 'determination of paper and paperboard folding resistance'; the smoothness of the T paper is determined by reference to the method specified in GB/T456-2002 "paper and paperboard smoothness determination (Bigge method)".
Except that in example 1, the pulp concentration of the pre-papermaking pond bottom pulp obtained through the pre-papermaking pond pulp strengthening step was 3.6%, the beating degree was 38 ° SR, the wet weight was 8g, and the web concentration of the pre-papermaking pond bottom pulp was 1.2%, so thatThe headbox lip opening of the fourdrinier machine was 10.8. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.5%, the concentration of a coarse screen to be 3.0%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.25%. In the slurry preparation step, the flow is more than or equal to 200m3And/h, the mass concentration of the pulp supply is 4.2%, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.2kg/t of paper, the dosage of the filter aid is 0.18kg/t of paper, and the dosage of the dye is 3.5kg/t of paper of yellow dye and 0.9kg/t of paper of red dye.
The difference of example 2 is that the pulp concentration of the headbox bottom stock obtained through the headbox stock enhancing step was 3.7%, the beating degree was 39 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 10.6. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 2.1%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.5%. In the slurry preparation step, the flow is more than or equal to 200m3And/h, the mass concentration of the pulp supply is 4.5%, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.20kg/t of paper, the dosage of the filter aid is 0.10kg/t of paper, and the dosage of the dye is 4.5kg/t of paper of yellow dye and 0.8kg/t of paper of red dye.
The difference of example 3 is that the pulp concentration of the headbox bottom stock obtained through the headbox stock enhancing step was 3.8%, the beating degree was 42 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 11.2. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 2.8%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.1%. In the slurry preparation step, the flow is more than or equal to 200m3The pulp supply mass concentration is 4.5%, and a retention aid, a filter aid and a dye are added, wherein the usage amount of the retention aid is 0.25kg/t of paper, the usage amount of the filter aid is 0.15kg/t of paper, and the usage amounts of the dye are 4.0kg/t of paper of yellow dye, 0.5kg/t of paper of red dye and 0.3kg/t of paper of black dye.
Example 4 differs in thatThe pulp concentration of the pulp at the bottom of the pulp making front pool obtained in the pulp enhancing step is 3.8%, the beating degree is 40 degrees SR, the wet weight is 7g, the net surfing concentration of the pulp at the bottom of the pulp making front pool is 1.5%, and the opening degree of a lip plate of a pulp flowing box of a fourdrinier is 10.8. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 3.0%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.3%. In the slurry preparation step, the flow is more than or equal to 200m3And/h, the mass concentration of the pulp supply is 4.5%, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.25kg/t of paper, the dosage of the filter aid is 0.15kg/t of paper, and the dosage of the dye is 4.3kg/t of paper of yellow dye and 0.2kg/t of paper of black dye.
Example 5 is different in that the pulp concentration of the headbox bottom stock obtained through the headbox stock enhancing step was 3.8%, the beating degree was 41 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 11.0. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 2.8%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.1%. In the slurry preparation step, the flow is more than or equal to 200m3The pulp supply mass concentration is 4.5%, and a retention aid, a filter aid and a dye are added, wherein the usage amount of the retention aid is 0.20kg/t of paper, the usage amount of the filter aid is 0.16kg/t of paper, and the usage amounts of the dye are 3.9kg/t of paper of yellow dye, 0.5kg/t of paper of red dye and 0.1kg/t of paper of black dye.
Example 6 is different in that the pulp concentration of the headbox bottom stock obtained in the headbox stock enhancing step was 3.8%, the beating degree was 42 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 11.6. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 2.8%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.3%. In the slurry preparation step, the flow is more than or equal to 200m3The mass concentration of pulp supply is 4.5 percent, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.25kg/t of paper, and the dosage of the filter aid is0.15kg/t paper, the dye dosage is 4.5kg/t paper of yellow dye and 0.8kg/t paper of red dye.
Example 7 is different in that the stock concentration of the headbox bottom stock obtained in the headbox stock enhancing step was 3.8%, the beating degree was 42 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 11.2. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.2%, the concentration of a coarse screen to be 2.8%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.1%. In the slurry preparation step, the flow is more than or equal to 200m3And/h, the mass concentration of the pulp supply is 4.5%, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.21kg/t of paper, the dosage of the filter aid is 0.15kg/t of paper, and the dosage of the dye is 0.9kg/t of paper of red dye and 0.5kg/t of paper of black dye.
Example 8 is different in that the pulp concentration of the headbox bottom stock obtained through the headbox stock enhancing step was 3.6%, the beating degree was 40 ° SR, the wet weight was 6g, the approach consistency of the headbox bottom stock was 1.5%, and the headbox lip opening was 11.5%. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.5%, the concentration of a coarse screen to be 3.5%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.0%. In the slurry preparation step, the flow is more than or equal to 200m3The pulp supply mass concentration is 4.0 percent, and a retention aid, a filter aid and a dye are also added, wherein the usage amount of the retention aid is 0.25kg/t of paper, the usage amount of the filter aid is 0.15kg/t of paper, and the usage amounts of the dye are 3.5kg/t of paper of yellow dye, 0.2kg/t of paper of red dye and 0.1kg/t of paper of black dye.
Example 9 is different in that the pulp concentration of the headbox bottom stock obtained in the headbox stock enhancing step was 3.8%, the beating degree was 42 ° SR, the wet weight was 7g, the approach consistency of the headbox bottom stock was 1.4%, and the headbox lip opening was 10.8. During purification screening and deslagging, a high-concentration deslagging device is used for controlling the concentration of crushed pulp to be 4.5%, the concentration of a coarse screen to be 2.9%, the concentration of a heavy deslagging device to be less than or equal to 1.0%, and the concentration of a first-stage fine screen to be 1.4%. In the step of pulp mixing, the flow rate is not less than200m3And/h, the mass concentration of the pulp supply is 4.3%, and a retention aid, a filter aid and a dye are also added, wherein the dosage of the retention aid is 0.25kg/t of paper, the dosage of the filter aid is 0.15kg/t of paper, and the dosage of the dye is 4.5kg/t of paper of yellow dye and 0.2kg/t of paper of black dye.
The T-papers produced by the processes of examples 1-9 were tested (T-paper test includes three indices of quantification, moisture, water absorption, color L, a, and b, burst resistance, folding resistance, smoothness, and content of white spots and black spots of appearance paper), and the test performance parameters are shown in table 1.
Table 1 test results for T-papers prepared by the manufacturing processes of examples 1-9
Figure BDA0002283828360000091
From the examples 1 to 9 and the detection results thereof, the production process provided by the invention can produce T paper meeting the quality requirements, and meet the individual requirements of the T paper with different colors. The blank production of the long mesh paper machine in the low-labored period of the corrugated paper market demand is filled, and the conditions of low profit and even negative profit per ton of paper wool are greatly improved. Provides a beneficial way for the vast papermaking enterprises to adopt a proper production process to reasonably arrange production equipment and improve the production efficiency.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.

Claims (10)

1. A method for producing T paper by a fourdrinier machine is characterized by comprising the following steps:
preparing materials: taking national waste A/B and European waste containing leucocarpin as raw materials;
pulping: mixing the raw materials with water by mass percent to obtain 3.0-4.5% of the mixture, and crushing the mixture to obtain crushed pulp;
purifying, screening and deslagging: purifying, screening and deslagging the crushed pulp;
concentrating, pulping and preparing pulp: concentrating in multiple discs until the mass concentration is 4-5%, pulping until the beating degree of the pulp is 38-42 DEG SR, preparing the pulp, and sending the pulp into a pre-pulping tank;
the method comprises the following steps of pulp enhancement of a fore-stock, papermaking by a fourdrinier machine, dehydration, surface sizing, calendaring and slitting, wherein when the fourdrinier machine is used for papermaking, the vacuum degree of a wire part is as follows: 6 to 8kPa of low vacuum fan at the net part, 9 to 11kPa of high vacuum fan at the net part, 32 to 37kPa of transfer vacuum at the bottom net, 2.5 to 3.5kPa of vacuum at the top net, 37 to 41kPa of low vacuum at the bottom net I, 38 to 42kPa of high vacuum at the bottom net II, 52 to 55kPa of low vacuum at the V-shaped rod, and 54 to 58kPa of high vacuum at the V-shaped rod.
2. The method according to claim 1, wherein the papermaking-ahead bottom stock obtained through the papermaking-ahead stock strengthening step has a stock concentration of 3.6 to 3.8%, a beating degree of 38 to 42 ° SR, and a wet weight of 6 to 9 g.
3. The method according to claim 2, wherein in the fourdrinier papermaking step, the approach consistency of the headbox bottom stock before papermaking is 1.2-1.5%, the retention rate is not less than 65%, and the pulp wire speed ratio is not less than 0.99.
4. The method according to claim 3, characterized in that the headbox lip opening of the fourdrinier machine is 10.6-11.5.
5. The method according to claim 1, wherein the national waste A/B and the European waste containing the leucocarpos are mixed in a mass ratio of 1:1 to obtain raw materials.
6. The method of claim 1, wherein the cleaning screening and deslagging comprises:
the high-concentration slag separator is used for controlling the concentration of crushed pulp to be 3.0-4.5%, the concentration of the coarse sieve is controlled to be 2.0-3.5%, the concentration of the heavy slag separator is less than or equal to 1.0%, and the concentration of the first-stage fine sieve is 1.0-1.5%.
7. The method as claimed in claim 1, wherein the slurry preparation step is carried out at a flow rate of 200m or more3The mass concentration of the slurry supply is 4.0-4.5 percent.
8. The method according to claim 7, characterized in that in the pulp preparation step, retention aid, drainage aid and dye are also added, wherein the retention aid is used in an amount of 0.2-0.25kg/t of paper, the drainage aid is used in an amount of 0.15-0.20kg/t of paper, and the dye is used in an amount comprising 3.5-4.5kg/t of paper for yellow dye, 0.5-0.9kg/t of paper for red dye and/or 0-0.5kg/t of paper for black dye.
9. The method according to claim 1, wherein the pre-papermaking pond slurry has a color of L: 64-65.5, a: 3.9-4.5, b: 14.0-14.4.
10. The method as set forth in claim 1, wherein the concentration step is performed with a multi-disc water amount of 550-650m3/h。
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Publication number Priority date Publication date Assignee Title
CN201390922Y (en) * 2008-12-17 2010-01-27 安徽山鹰纸业股份有限公司 Recycled cardboard paper pulp forming device
CN102191727A (en) * 2011-03-31 2011-09-21 广东理文造纸有限公司 Preparation process of environmental protection liner paper
CN109024058A (en) * 2018-08-13 2018-12-18 联盛纸业（龙海）有限公司 A kind of kraft paperboard production technology
CN109056406A (en) * 2018-08-10 2018-12-21 南京林业大学 High-grade T cardboard and its production method
CN109837799A (en) * 2019-03-11 2019-06-04 南京林业大学 A kind of preparation method improving low grammes per square metre T cardboard ring crush intensity
CN110144752A (en) * 2019-06-04 2019-08-20 联盛纸业（龙海）有限公司 A kind of production technology of high internal bond fluting medium

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201390922Y (en) * 2008-12-17 2010-01-27 安徽山鹰纸业股份有限公司 Recycled cardboard paper pulp forming device
CN102191727A (en) * 2011-03-31 2011-09-21 广东理文造纸有限公司 Preparation process of environmental protection liner paper
CN109056406A (en) * 2018-08-10 2018-12-21 南京林业大学 High-grade T cardboard and its production method
CN109024058A (en) * 2018-08-13 2018-12-18 联盛纸业（龙海）有限公司 A kind of kraft paperboard production technology
CN109837799A (en) * 2019-03-11 2019-06-04 南京林业大学 A kind of preparation method improving low grammes per square metre T cardboard ring crush intensity
CN110144752A (en) * 2019-06-04 2019-08-20 联盛纸业（龙海）有限公司 A kind of production technology of high internal bond fluting medium

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Application publication date: 20200410